81894327122 has 16 divisors (see below), whose sum is σ = 124082318232. Its totient is φ = 40533715200.

The previous prime is 81894327083. The next prime is 81894327127. The reversal of 81894327122 is 22172349818.

It can be written as a sum of positive squares in 4 ways, for example, as 53508479761 + 28385847361 = 231319^2 + 168481^2 .

It is not an unprimeable number, because it can be changed into a prime (81894327127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1055978 + ... + 1130874.

Almost surely, 2^81894327122 is an apocalyptic number.

81894327122 is a deficient number, since it is larger than the sum of its proper divisors (42187991110).

81894327122 is a wasteful number, since it uses less digits than its factorization.

81894327122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80413.

The product of its digits is 387072, while the sum is 47.

The spelling of 81894327122 in words is "eighty-one billion, eight hundred ninety-four million, three hundred twenty-seven thousand, one hundred twenty-two".